C++ (Cpp) labpc_suggest_transfer_size Examples

Example #1

File: ni_labpc_isadma.c Project: AlexShiLucky/linux

void labpc_setup_dma(struct comedi_device *dev, struct comedi_subdevice *s)
{
	struct labpc_private *devpriv = dev->private;
	struct comedi_isadma_desc *desc = &devpriv->dma->desc[0];
	struct comedi_cmd *cmd = &s->async->cmd;
	unsigned int sample_size = comedi_bytes_per_sample(s);

	/* set appropriate size of transfer */
	desc->size = labpc_suggest_transfer_size(dev, s, desc->maxsize);
	if (cmd->stop_src == TRIG_COUNT &&
	    devpriv->count * sample_size < desc->size)
		desc->size = devpriv->count * sample_size;

	comedi_isadma_program(desc);

	/* set CMD3 bits for caller to enable DMA and interrupt */
	devpriv->cmd3 |= (CMD3_DMAEN | CMD3_DMATCINTEN);
}

Example #2

File: ni_labpc_isadma.c Project: 383530895/linux

void labpc_setup_dma(struct comedi_device *dev, struct comedi_subdevice *s)
{
	struct labpc_private *devpriv = dev->private;
	struct comedi_cmd *cmd = &s->async->cmd;
	unsigned long irq_flags;

	irq_flags = claim_dma_lock();
	disable_dma(devpriv->dma_chan);
	/* clear flip-flop to make sure 2-byte registers for
	 * count and address get set correctly */
	clear_dma_ff(devpriv->dma_chan);
	set_dma_addr(devpriv->dma_chan, devpriv->dma_addr);
	/* set appropriate size of transfer */
	devpriv->dma_transfer_size = labpc_suggest_transfer_size(cmd);
	if (cmd->stop_src == TRIG_COUNT &&
	    devpriv->count * sample_size < devpriv->dma_transfer_size)
		devpriv->dma_transfer_size = devpriv->count * sample_size;
	set_dma_count(devpriv->dma_chan, devpriv->dma_transfer_size);
	enable_dma(devpriv->dma_chan);
	release_dma_lock(irq_flags);
	/* set CMD3 bits for caller to enable DMA and interrupt */
	devpriv->cmd3 |= (CMD3_DMAEN | CMD3_DMATCINTEN);
}